** Be sure to get the second edition (from 2008). The first edition (from 2003) is outdated.

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* [http://www.amazon.com/Programming-Environment-Addison-Wesley-Professional-Computing/dp/0321525949/ref=sr_1_1?ie=UTF8&s=books&qid=1259788186&sr=8-1 Advanced Programming in the UNIX Environment, Second Edition] by the late W. Richard Stevens and Stephen A. Rago

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** Not embedded specific, but THE reference for Linux/Unix programming

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* [http://www.amazon.com/Linux-System-Programming-Robert-Love/dp/0596009585/ref=sr_1_1?ie=UTF8&s=books&qid=1259788281&sr=1-1 Linux System Programming] - by Robert Love